Document gbX137xgMy6QXBVxxG7eygMGN

March A, 1969 Mr. Leon a. Woods Depa rlu-.ent of Hah End Qant PoticIdea Investigations 93J Jdir,lLh Drive Sucftraeiito, Calif ornia 95)319 Dear Mr. Woodai In reply to your latter of Pelruary 27, I have enclosed a tat la showing the general physics 1 propartlaa of our Aroelors. At the bottom of this table X have added the reeelte determined In oral toxicity etudlea with rata and the minimum lethal tlaae of the Aroelora when applied to the ehaven akin of rabbits, lou will notice that ther* la a dlffaranoa In tha manner In Which the sample la administered doe to the physical form of the sample, its viscosity, aoletlllty, etc. Ha believe that these data show that tbs Aroelora are not seriously toxic from tha standpoint of aeuta single exposures. A second enclosure le a reprint describing tbs results of chronic inhalation experiments on two ef the Aroelers. Ibis work baa lad to tha astabllahmeat of a threshold limit vales of l.o milligrams per cubic meter for Areelor 1212 and 0.5 milligram per cubic meter for Aroelor 125*. ferbeps X should point out that our designation ef the Aroelora by mwdbera indicates tbs parent material and tha degree ef chlorine, for example tha 1200 aeries are UMunyli chlorinated te various percentages. Thus, Aroelor 12*2 is biphenyl chlorinated to the extent of *2g, Arosier 125* is biphenyl ehlorlnated te 5*^. The eerlee beginning with the numerals 2* and At are MUMS 089292 Kerch h, l;o i iliii t(j.; ll pill).'v id a no cn l-.Tine tee trlplxn.vlr. r.n* 'i eerie: srt cli) < rlntte.. trlphcny t. 'I I <1 tnc Aroclor* are practically ion o lull* lit water. lor irK l'i' U.-'t;- is e 'lulie in. water t 2;>rC only to the c:r.cnt `i 3?'Jj plus or eiaue 10 parte per l-ll lion. Aroclor iZHa 1 11 p lua or itl.nue 19 ppl ana Aroc lor iSzik ;,s> plus or tclnue i ' tvi'uEi* tncreasliir'. the chlorine content <Scree# the t.-luillily c-I the iraterltl. U 1 'on Ic. cl any fur titer utliUuict, plane* let tie Vuiot*. Sincerely, i'lwt- 1'. Wheeler Hur.apcr, txivlionmer.tal Health l.i;i l'>eui-efi l ot.: V;. H. Klchtru Y. C. burden It. I.. Keller !>. Tucker J. t. ilprlntgtte MQNS 009^93